234 lines
8.0 KiB
Python
234 lines
8.0 KiB
Python
"""Helper functions for writing to terminals and files."""
|
|
import os
|
|
import shutil
|
|
import sys
|
|
from typing import Optional
|
|
from typing import Sequence
|
|
from typing import TextIO
|
|
|
|
from .wcwidth import wcswidth
|
|
from _pytest.compat import final
|
|
|
|
|
|
# This code was initially copied from py 1.8.1, file _io/terminalwriter.py.
|
|
|
|
|
|
def get_terminal_width() -> int:
|
|
width, _ = shutil.get_terminal_size(fallback=(80, 24))
|
|
|
|
# The Windows get_terminal_size may be bogus, let's sanify a bit.
|
|
if width < 40:
|
|
width = 80
|
|
|
|
return width
|
|
|
|
|
|
def should_do_markup(file: TextIO) -> bool:
|
|
if os.environ.get("PY_COLORS") == "1":
|
|
return True
|
|
if os.environ.get("PY_COLORS") == "0":
|
|
return False
|
|
if "NO_COLOR" in os.environ:
|
|
return False
|
|
if "FORCE_COLOR" in os.environ:
|
|
return True
|
|
return (
|
|
hasattr(file, "isatty") and file.isatty() and os.environ.get("TERM") != "dumb"
|
|
)
|
|
|
|
|
|
@final
|
|
class TerminalWriter:
|
|
_esctable = dict(
|
|
black=30,
|
|
red=31,
|
|
green=32,
|
|
yellow=33,
|
|
blue=34,
|
|
purple=35,
|
|
cyan=36,
|
|
white=37,
|
|
Black=40,
|
|
Red=41,
|
|
Green=42,
|
|
Yellow=43,
|
|
Blue=44,
|
|
Purple=45,
|
|
Cyan=46,
|
|
White=47,
|
|
bold=1,
|
|
light=2,
|
|
blink=5,
|
|
invert=7,
|
|
)
|
|
|
|
def __init__(self, file: Optional[TextIO] = None) -> None:
|
|
if file is None:
|
|
file = sys.stdout
|
|
if hasattr(file, "isatty") and file.isatty() and sys.platform == "win32":
|
|
try:
|
|
import colorama
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
file = colorama.AnsiToWin32(file).stream
|
|
assert file is not None
|
|
self._file = file
|
|
self.hasmarkup = should_do_markup(file)
|
|
self._current_line = ""
|
|
self._terminal_width: Optional[int] = None
|
|
self.code_highlight = True
|
|
|
|
@property
|
|
def fullwidth(self) -> int:
|
|
if self._terminal_width is not None:
|
|
return self._terminal_width
|
|
return get_terminal_width()
|
|
|
|
@fullwidth.setter
|
|
def fullwidth(self, value: int) -> None:
|
|
self._terminal_width = value
|
|
|
|
@property
|
|
def width_of_current_line(self) -> int:
|
|
"""Return an estimate of the width so far in the current line."""
|
|
return wcswidth(self._current_line)
|
|
|
|
def markup(self, text: str, **markup: bool) -> str:
|
|
for name in markup:
|
|
if name not in self._esctable:
|
|
raise ValueError(f"unknown markup: {name!r}")
|
|
if self.hasmarkup:
|
|
esc = [self._esctable[name] for name, on in markup.items() if on]
|
|
if esc:
|
|
text = "".join("\x1b[%sm" % cod for cod in esc) + text + "\x1b[0m"
|
|
return text
|
|
|
|
def sep(
|
|
self,
|
|
sepchar: str,
|
|
title: Optional[str] = None,
|
|
fullwidth: Optional[int] = None,
|
|
**markup: bool,
|
|
) -> None:
|
|
if fullwidth is None:
|
|
fullwidth = self.fullwidth
|
|
# The goal is to have the line be as long as possible
|
|
# under the condition that len(line) <= fullwidth.
|
|
if sys.platform == "win32":
|
|
# If we print in the last column on windows we are on a
|
|
# new line but there is no way to verify/neutralize this
|
|
# (we may not know the exact line width).
|
|
# So let's be defensive to avoid empty lines in the output.
|
|
fullwidth -= 1
|
|
if title is not None:
|
|
# we want 2 + 2*len(fill) + len(title) <= fullwidth
|
|
# i.e. 2 + 2*len(sepchar)*N + len(title) <= fullwidth
|
|
# 2*len(sepchar)*N <= fullwidth - len(title) - 2
|
|
# N <= (fullwidth - len(title) - 2) // (2*len(sepchar))
|
|
N = max((fullwidth - len(title) - 2) // (2 * len(sepchar)), 1)
|
|
fill = sepchar * N
|
|
line = f"{fill} {title} {fill}"
|
|
else:
|
|
# we want len(sepchar)*N <= fullwidth
|
|
# i.e. N <= fullwidth // len(sepchar)
|
|
line = sepchar * (fullwidth // len(sepchar))
|
|
# In some situations there is room for an extra sepchar at the right,
|
|
# in particular if we consider that with a sepchar like "_ " the
|
|
# trailing space is not important at the end of the line.
|
|
if len(line) + len(sepchar.rstrip()) <= fullwidth:
|
|
line += sepchar.rstrip()
|
|
|
|
self.line(line, **markup)
|
|
|
|
def write(self, msg: str, *, flush: bool = False, **markup: bool) -> None:
|
|
if msg:
|
|
current_line = msg.rsplit("\n", 1)[-1]
|
|
if "\n" in msg:
|
|
self._current_line = current_line
|
|
else:
|
|
self._current_line += current_line
|
|
|
|
msg = self.markup(msg, **markup)
|
|
|
|
try:
|
|
self._file.write(msg)
|
|
except UnicodeEncodeError:
|
|
# Some environments don't support printing general Unicode
|
|
# strings, due to misconfiguration or otherwise; in that case,
|
|
# print the string escaped to ASCII.
|
|
# When the Unicode situation improves we should consider
|
|
# letting the error propagate instead of masking it (see #7475
|
|
# for one brief attempt).
|
|
msg = msg.encode("unicode-escape").decode("ascii")
|
|
self._file.write(msg)
|
|
|
|
if flush:
|
|
self.flush()
|
|
|
|
def line(self, s: str = "", **markup: bool) -> None:
|
|
self.write(s, **markup)
|
|
self.write("\n")
|
|
|
|
def flush(self) -> None:
|
|
self._file.flush()
|
|
|
|
def _write_source(self, lines: Sequence[str], indents: Sequence[str] = ()) -> None:
|
|
"""Write lines of source code possibly highlighted.
|
|
|
|
Keeping this private for now because the API is clunky. We should discuss how
|
|
to evolve the terminal writer so we can have more precise color support, for example
|
|
being able to write part of a line in one color and the rest in another, and so on.
|
|
"""
|
|
if indents and len(indents) != len(lines):
|
|
raise ValueError(
|
|
"indents size ({}) should have same size as lines ({})".format(
|
|
len(indents), len(lines)
|
|
)
|
|
)
|
|
if not indents:
|
|
indents = [""] * len(lines)
|
|
source = "\n".join(lines)
|
|
new_lines = self._highlight(source).splitlines()
|
|
for indent, new_line in zip(indents, new_lines):
|
|
self.line(indent + new_line)
|
|
|
|
def _highlight(self, source: str) -> str:
|
|
"""Highlight the given source code if we have markup support."""
|
|
from _pytest.config.exceptions import UsageError
|
|
|
|
if not self.hasmarkup or not self.code_highlight:
|
|
return source
|
|
try:
|
|
from pygments.formatters.terminal import TerminalFormatter
|
|
from pygments.lexers.python import PythonLexer
|
|
from pygments import highlight
|
|
import pygments.util
|
|
except ImportError:
|
|
return source
|
|
else:
|
|
try:
|
|
highlighted: str = highlight(
|
|
source,
|
|
PythonLexer(),
|
|
TerminalFormatter(
|
|
bg=os.getenv("PYTEST_THEME_MODE", "dark"),
|
|
style=os.getenv("PYTEST_THEME"),
|
|
),
|
|
)
|
|
return highlighted
|
|
except pygments.util.ClassNotFound:
|
|
raise UsageError(
|
|
"PYTEST_THEME environment variable had an invalid value: '{}'. "
|
|
"Only valid pygment styles are allowed.".format(
|
|
os.getenv("PYTEST_THEME")
|
|
)
|
|
)
|
|
except pygments.util.OptionError:
|
|
raise UsageError(
|
|
"PYTEST_THEME_MODE environment variable had an invalid value: '{}'. "
|
|
"The only allowed values are 'dark' and 'light'.".format(
|
|
os.getenv("PYTEST_THEME_MODE")
|
|
)
|
|
)
|